Combine all dry ingredients in a medium-sized mixing bowl. Whisk well, removing any clumps.
Add in the melted coconut oil slowly, followed by the essential oils. Spritz the mixture with a little witch hazel (you don’t need much!) and stir well.
The mixture should be the consistency of wet sand. If yours isn’t, spray with a little more witch hazel.
Once you’ve added all of the liquid into the dry mixture, you’re ready to fill your molds. You want to overfill each side of the mold so that when you press the sides together, any excess comes out.
If you find the two sides of your bomb aren’t sticking together or falling apart when you remove them from the mold, you might need to add a tiny bit more water to your mixture and start the molding process over again.
I let my bath bombs rest overnight before removing them from the mold. If you find that they don’t come out readily, warm the mold with a hair dryer for a few seconds before trying again. Remove the bath bombs from the mold, place them on parchment paper, and allow them to dry for another 24 hours.